Carbon managers will advise you independently and at an agreed fee on:
The existing power costs.
This can be read from the electricity invoice. It is a not simple. The invoice has details on the “back” that show us days that the system is used, the rates applicable for peak and other times, the charge for power and the cost of transmission. Some users get a discount. Some have different operational use and all of these have to be assessed. The period of the supplier contact is a determinant. Therefore we wont recommend a size that is more than needed.
The size of the roof or surrounds.
It is of little use in any advice if the rood area is too small to house a system or if the roof faces south. We can examine that by using Google maps or 6 Maps in NSW. There are some factories that have trees over the roof and this reduces the sun and use.
Some roves are light weight in carrying capacity and so a load of panels will have to be engineered. There are light weight car park “ports” that allow for collection of sun light and protection of the car in the heat of summer. This has not been used extensively but will soon . It has application in a McDonalds where the roof size is usually too small to have any effect on the huge electricity cost but if there were a car port carrying panels , a lot more could be generated. This has been offered to McDonalds but not taken up as yet due to the world wide specifications of how a franchise must appear.
Panels, Inverters and batteries.
A panel is not another panel as there are variations in offerings by makers as to warranty and efficiency. These are reflected in the price paid. There is a quality specification and a world standard test. There are the usual cheap end that will do the job for a short time and there are the 25 year warranted panel that may not be recommended all the time. There are well known manufacturers that have made other electrical products and are house hold names and we will tend to recommend these.
Installer and the connections.
The last few years have seen big steps in improving the skills of installers. The Clean Energy Council has set up continuous training and development programmes so that a registered installer is essential and not “any -old-electrician” . Most complaints are about installation.
- a roof of 1000 M 2 can generate $ 30,000 a year ( at current rates of 0.25cents) in panel generated electricity and can cost between $ 107,900 and $ 186,525 ( CEC figures ) and the QUESTION IS : why the big difference ?
- the location, height roof configuration tilt
- the panels-inverter-batteries chosen
- monitoring equipment installed -distribution board –cabling-existing system upgrades needed
- engineering of the roof –can it carry
- after sales agreements
- government rebates
- trees and shading
- contractor installation costs.
Savings and Returns
Based on current costs there is a 3 to 5 year pay back of the capital cost. This can be longer depending on the cost. The panels can reduce the power bill by up to 35 to 50%. The ATO have a depreciation rate. Electricity sold to the grid is assessable. The lease is a deduction.